package main
import (
	"fmt"
	"strings"
)

func main() {
	var str string = "vnacbx"
	srunes := []rune(str)

	for i:=0;i<len(srunes);i++ {
		if srunes[i] == 97 || srunes[i] == 98 || srunes[i] == 99 {
			srunes[i] = srunes[i] + int32(23)
		}
	}
	str = strings.ToUpper(string(srunes))
	fmt.Println(str)
}